Physical and mechanical properties of cement mortar made with brick waste Guendouz Mohamed 1 , Boukhelkhal Djamila 1 1 LME Laboratory, University of Medea, Medea, Algeria Abstract. The development of new building materials is a current problem where researchers are trying to find the right materials for each region and returning cheapest countries. Recycling and recovery of waste are now considered as a promising solution to meet the deficit between production and consumption and protecting the environment. This work focused on the study of the effect of brick waste in the production of cement mortar with substitution rates ranging from 5-30% by weight of cement and to compare its performance with fresh and hardened state with ordinary mortar considered as control mortar. Compressive and tensile strengths up to 28 days of age were compared with those of controlled mortar. Water absorption was also measured at 28 days of age. The test results indicate the beneficial effect of brick waste powder on performance of cement mortar with an optimum of 15% of cement weight substitution. 1 Introduction The manufacturing of cement, mortar and concrete, as is the case with many industrial materials, consumes a considerable amount of energy, generates large quantities of greenhouse gases (estimated today to 1 tone of CO 2 per 1 tone of cement produced in the world), contributes to the gradual depletion of natural resources and leads to the production of certain residues which must be eliminated. In order to ensure the growth of these indispensable building materials, the sustainable development approach must be integrated into their production, thus achieving a balance between environmental protection constraints and economic and social considerations [1-5]. Therefore, in view of the increasing need for materials resources and the need to preserve the environment in a sustainable development vision, it has become necessary and relevant to explore all possibilities for reuse and recovery of waste and - industrial products, particularly in the field of civil engineering. However the waste storage disposals are becoming also a serious environmental problem, especially for main cities where disposal sites are lacking. Wastes from construction materials, materials factories, demolition sites, earthquakes and natural disasters are until now rarely used in Algeria: there is hence a need for recycling more and more waste materials. The need to find new and cheaper binders has led manufacturers to produce various cements containing in addition to clinker, secondary additions with varying proportions. In Algeria, blast furnace slag and pozzolana are used as an additive to cement. Other local materials can also be used and valorized. And it is in this context that our study takes place. It aims to develop new composite cement based on brick waste and having a strength class of 42.5MPa. These by-products of the red products industry, which remain little used or recycled so far, are relatively abundant in Algeria because of the high number of brickyards and the discharge rates (non- compliant or broken bricks) They generate and account for 10 to 15% of their productions [6, 7]. The terracotta products are really very durable and their resistance to the test proves it. Moreover, studies carried out by several researchers have shown the beneficial effect of the use of this type of waste [8-11] in addition to the pozzolanic character of the latter [8, 12- 16]. The objective of this work is to study the effect on physical and mechanical properties of mortar made with fine crushed brick waste powder. Cement is substituted by weight by bricks waste powder at rates varying from 0, 5, 10, 15, 20, 25 and 30%. Compressive and tensile strengths are evaluated and compared up to 28 days of age. Capillary water absorption is also measured at 28 days of age 2 Experimental 2.1 Materials Portland Composite Cement based on limestone (CEM II/A 42.5) with a fineness of 3080 cm 2 /g and a specific gravity of 2.93 g/cm 3 was used in this study. Its average compressive strength at 28 days is 46.43 MPa. MATEC Web of Conferences 149, 01077 (2018) https://doi.org/10.1051/matecconf/201814901077 CMSS-2017 © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
Physical and mechanical properties of cement mortar made with brick waste
Apr 26, 2023
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